在MOSS文档库或图片库中创建文件夹

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.ComponentModel;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;

public partial class WSGL_Controls_CreateFolder : System.Web.UI.UserControl
{
    #region  定义变量和属性

    private SPSite sps;
    private SPWeb spw;
    private SPList list;
    private SPListItemCollection items;

    private string folderUrl;
    /// <summary>
    /// 文件夹所在的完整路径，如"/dept/gsb/DocLib5/测试"
    /// </summary>
    [Category("控件自定义属性")]
    [Description("新建文件夹父文件夹的路径,如:/dept/gsb/DocLib5/测试")]
    [Browsable(true)]
    public string FolderUrl
    {
        get
        {
            return folderUrl;
        }
        set
        {
            folderUrl = value;
        }
    }

    private string folderName;
    /// <summary>
    /// 文件夹名称
    /// </summary>
    [Category("控件自定义属性")]
    [Description("新建文件夹的名称")]
    [Browsable(true)]
    public string FolderName
    {
        get
        {
            return folderName;
        }
        set
        {
            folderName = value;
        }
    }
    #endregion

    protected void Page_Load(object sender, EventArgs e)
    {
        sps = GetWebSite("/" + ConfigurationManager.AppSettings["site"] + "/", this.Context);
        sps.AllowUnsafeUpdates = true;
        spw = sps.OpenWeb();
        spw.AllowUnsafeUpdates = true;
    }
    protected void btnOk_Click(object sender, EventArgs e)
    {
        //创建文件夹
        CreateFolder(FolderUrl, FolderName);
    }

    /// <summary>
    /// 从配置参数中取得站点
    /// </summary>
    /// <param name="siteurl"></param>
    /// <param name="Context"></param>
    /// <returns></returns>
    public SPSite GetWebSite(string siteurl, System.Web.HttpContext Context)
    {

        SPSite s = null;
        if (siteurl != "" && siteurl != null)
        {
            //处理各种地址的写法			
            if (!siteurl.ToUpper().StartsWith("HTTP"))//如果是相对地址形式
            {
                string thisurl = SPControl.GetContextSite(Context).Url;
                int index = thisurl.IndexOf("/", 8);
                if (index > 0)//如果本地址是根目录
                {
                    siteurl = thisurl.Substring(0, index) + siteurl;
                }
                else//如果本地址不是要站点
                {
                    siteurl = thisurl + siteurl;
                }

            }
            s = new SPSite(siteurl);
        }

        return s;
    }

    #region  创建文件夹
    /// <summary>
    /// 在指定的文档库中创建文件夹
    /// </summary>
    /// <param name="folderUrl"></param>
    /// <param name="folderName"></param>
    protected void CreateFolder(string oldfolderUrl, string newfolderName)
    {
        SPFolder parent = spw.GetFolder(oldfolderUrl);
        if (parent.Exists)
        {
            list = spw.Lists.GetList(parent.ParentListId, true);
            SPListItem item = list.Folders.Add(oldfolderUrl, SPFileSystemObjectType.Folder);
            item["名称"] = newfolderName;
            item.Update();
        }
    }
    #endregion
}